use one coupon code for both recurring % discount and sign-up fee % discount for WooCommerce Subscriptions

file.php

// not sure what to do with this code snippet? See https://www.thathandsomebeardedguy.com/what-do-i-do-with-these-code-snippets/
// BTC Donations to: bc1qc2s60yct2aqza4r7ryweheepd8xa8wqpfgdhg3

add_filter( 'woocommerce_coupon_get_discount_amount', 'handsome_bearded_guy_coupon_maybe_discount_sign_up_fee_too', 20, 5 );

function handsome_bearded_guy_coupon_maybe_discount_sign_up_fee_too( $discount, $discounting_amount, $item, $single, $coupon ) {
	if ( 'recurringandsignupdiscount' === $coupon->get_code() && is_callable( array( 'WC_Subscriptions_Product', 'get_sign_up_fee' ) ) ) {
		$discounting_amount = WC_Subscriptions_Product::get_sign_up_fee( $item['data'] );
		$discount_percent   = $coupon->get_amount() / 100;
		$discount           = $discounting_amount * $discount_percent;
	}
	return $discount;

}